MD5随机盐值生成法
public class Test3 { /** * 生成含有随机盐的密码 */ public static String generate(String password) { Random r = new Random(); StringBuilder sb = new StringBuilder(16); sb.append(r.nextInt(99999999)).append(r.nextInt(99999999)); int len = sb.length(); if (len < 16) { for (int i = 0; i < 16 - len; i++) { sb.append("0"); } } String salt = sb.toString(); password = md5Hex(password + salt); char[] cs = new char[48]; for (int i = 0; i < 48; i += 3) { //取MD5后密文的第一位 cs[i] = password.charAt(i / 3 * 2); //取盐值的第一位 char c = salt.charAt(i / 3); cs[i + 1] = c; //取MD5后密文的第二位 cs[i + 2] = password.charAt(i / 3 * 2 + 1); } //生成的密文包括MD5的密文和盐值,顺序为一位密文,一位盐值,一位密文 return new String(cs); } /** * 校验密码是否正确 */ public static boolean verify(String password, String md5) { char[] cs1 = new char[32]; char[] cs2 = new char[16]; for (int i = 0; i < 48; i += 3) { cs1[i / 3 * 2] = md5.charAt(i); cs1[i / 3 * 2 + 1] = md5.charAt(i + 2); cs2[i / 3] = md5.charAt(i + 1); } String salt = new String(cs2); return md5Hex(password + salt).equals(new String(cs1)); } /** * 获取十六进制字符串形式的MD5摘要 */ public static String md5Hex(String src) { try { MessageDigest md5 = MessageDigest.getInstance("MD5"); byte[] bs = md5.digest(src.getBytes()); return new String(new Hex().encode(bs)); } catch (Exception e) { return null; } } public static void main(String[] args) { String password = generate("admin"); System.out.println(password); System.out.println(verify("admin", password)); }